[PATCH] gdb: trivial segfault fix in tui

[Hal Ashburner <hal@ashburner.info>]

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Hello!

I hope this is the correct etiquette and that it's useful. Copyright
assigned to whoever commits to assign to GNU or do whatever is
appropriate (assuming it is committed).

To the easiest way to replicate the segfault:
gdb some_prog
b main
run
C-x a
C-x 2
C-x 2
C-x 2 -- so you now have registers on the top panel and source in the middle.
resize the terminal.
step,
segfault

Regards,
Hal

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diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 9ba9b1d..0c94aed 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -334,11 +334,13 @@ tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s,
 int
 tui_source_is_displayed (char *fname)
 {
-  return (TUI_SRC_WIN->generic.content_in_use 
-	  && (filename_cmp (((struct tui_win_element *)
-			     (tui_locator_win_info_ptr ())->
-			     content[0])->which_element.locator.file_name,
-			    fname) == 0));
+  if (tui_locator_win_info_ptr()->content)
+      return (TUI_SRC_WIN->generic.content_in_use 
+          && (filename_cmp (((struct tui_win_element *)
+                     (tui_locator_win_info_ptr ())->
+                     content[0])->which_element.locator.file_name,
+                    fname) == 0));
+  return 0;
 }